RIEZLER, rēts'lẽr, Siegmund von (1843—). A German historian, born in Munich. He was educated there, became a docent in 1869, and after ten years as head of the archives and library of Donaueschingen was made court and city librarian in Munich, in 1883, and director of the Maximilianeum in 1885. His works, dealing for the most part with Bavarian history, include: Das Herzogtum Bayern zur Zeit Heinrichs desLöwen (1867, with Heigel), Der KreuzzugKaiser Friedrichs I. (1870), the great GeschichteBayerns (1878-99), Die bayrische Politik imSchmalkaldischen Kriege (1895), and Geschichteder Hexenprozesse in Bayern (1896).